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mm/huge_memory: allow split shmem large folio to any lower order

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Commit 4d684b5f92ba ("mm: shmem: add large folio support for tmpfs") has
added large folio support to shmem.  Remove the restriction in
split_huge_page*().

Link: https://lkml.kernel.org/r/20250122161928.1240637-2-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Yang Shi <yang@os.amperecomputing.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Kirill A. Shuemov <kirill.shutemov@linux.intel.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zi Yan 2025-01-22 11:19:27 -05:00 committed by Andrew Morton
parent 035a112e5f
commit 9b2f764933
1 changed files with 1 additions and 7 deletions
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8
mm/huge_memory.c
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@ -3299,7 +3299,7 @@ static void __split_huge_page(struct page *page, struct list_head *list,
/* Some pages can be beyond EOF: drop them from page cache */
if (tail->index >= end) {
if (shmem_mapping(folio->mapping))
nr_dropped++;
nr_dropped += new_nr;
else if (folio_test_clear_dirty(tail))
folio_account_cleaned(tail,
inode_to_wb(folio->mapping->host));
@ -3465,12 +3465,6 @@ int split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
return -EINVAL;
}
} else if (new_order) {
/* Split shmem folio to non-zero order not supported */
if (shmem_mapping(folio->mapping)) {
VM_WARN_ONCE(1,
"Cannot split shmem folio to non-0 order");
return -EINVAL;
}
/*
* No split if the file system does not support large folio.
* Note that we might still have THPs in such mappings due to